ty::Predicate::ObjectSafe(..) => None,
ty::Predicate::ConstEvaluatable(..) => None,
- // NB: This predicate is created by breaking down a
+ // N.B., this predicate is created by breaking down a
// `ClosureType: FnFoo()` predicate, where
// `ClosureType` represents some `Closure`. It can't
// possibly be referring to the current closure,